Overhead projectors (OHPs) come in a variety of makes but all have similar features. They contain two bulbs. At any time, one of these bulbs can project light through the fresnel, which diffuses the light, through the glass stage, through a lens in the projector head, and then onto a screen.
BINT AL JAZEERA ELECTRONICS
P.O. Box: 46845, Abu Dhabi, UAE, Dhabi, , United Arab Emirates